ΔTeq for some body segments increase when the face is partically cooled.

[AkihisaNomoto]

[Skin temperature control at 34C]

• The head is cooled as expected.
• The left forearm and left hand are cooled because the manikin can not hold her arm and received some air movement.
• The pelvis, thigh, and some other body parts have some measurable positive ΔTeq. The same trend can be seen for other PCS. Looks like ΔTeq of some body segments gets high when one body is partially cooled. I thought that the manikin's power is individually controlled, but apparently it is not... As a result, the whole body impact would be calculated to be small.

[Comfort control] Example plot of local ΔTeq for local body segments when desk fans were used. Looks like there is no such issue when this mode is used.

I am a bit puzzled about how I should handle the issue.

I am now thinking:

1. Compare the same PCS results with the skin temperature control and the comfort control, and clearly make sure the issue of skin temperature conrtol.
2. [Might be a big issue] Change all of the positive values to 0 when the body is cooled. Will keep the original data.
3. Correct the value for the whole body from (1) the local body area and (2) the changed value

@mairaUSYD, @tom-parkinson I would appreciate if you could give me some feedback or comments!

[tom-parkinson]

@Jing-a-ling is better placed to advise. I can sit down and think about this early next week.

[tom-parkinson]

@AkihisaNomoto I think it's a good idea to contact the supplier for the manikin to clarify this. Can you please draft an email that explains the manikin settings and experiment setup? I can then send it and cc you in.

[tom-parkinson]

The reply from PT Manikins didn't really yield much in the way of a solution.

He suggests that there could be some (downward) turbulence around the upper body which is holding down the upwards movement of the warm air from the pelvis and thighs. This could be checked by pointing the ventilator a bit upwards.
Another thought is that pelvis and (to a lesser extent) the thighs have a relatively high thermal mass due to the plastic joints. Maybe these joints/middleplate were not completely heated (to 34C) when you did the reference test?

[mairaUSYD]

Most tests were done in February/March. I run a few in May. Considering what he said, I understand we should zero the pelvis and thighs because even if we understand what is causing it, it does not make sense; it is an error or a manikin limitation-related issue. The cooling PECS (fans) were all directed to the manikin's head. And we will need to recalculate the overall heat loss by weighing the sum of each body part by its area.